So i wanted to get a flash and i decided that the Yn560 is the one i should get. I just have a few questions i need answered. First of all, i know that you can trigger the flash when it is off camera via the built in flash on my E-M10. My question is, i noticed there is transmitters you can buy and i was wondering exactly how they work so i can trigger the flash off camera without the on board flash on my camera. I noticed the one made by the same company called the RF-603. So my question is exactly how do these work, and how many i need, and is it possible to buy one from another company and would it work. Thank you

If it's 560III or IV then you just need an RF603 for the camera as the 560 has a receiver built in. From my experience I found the Nikon version 603 was much easier to attach to the camera hotshoe compared to the Canon model.

Note that the 560 IV has a built in RF transmitter, so if you get the "IV" version, you don't need to purchase an extra RF controller (however the built in transmitter is not as full featured as the stand alone yn560-tx.)

I made very good experience with the Yongnuos. The 560III has a build in receiver, the only thing you need is the transmitter. Yongnuo is offering a really charming one: the 560 TX Controller: There you can control several off Camera flashes - and you carry the transmitter and the flashes, thats all: very convenient!!

My setup when shooting studio is two RF-603 one on cam the other on a 560TX who then talks to the flashes on a different channel. This pair i carry with me with a phone running the camera remotely, this way i can walk arround fire the camera and either adjust the flash levels on the TX or walk to the flash and move it, then take a new test shot without having to go to the camera.
Saves tons of time!

My setup when shooting studio is two RF-603 one on cam the other on a 560TX who then talks to the flashes on a different channel. This pair i carry with me with a phone running the camera remotely, this way i can walk arround fire the camera and either adjust the flash levels on the TX or walk to the flash and move it, then take a new test shot without having to go to the camera.
Saves tons of time!

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Interesting setup, but this works only if you have a camera which is controlled by wifi, or - like the Panasonics... I will have to test this out....

Yes i guess that is true, you could also use the 603 in your hand as a remote trigger and if the cam is tethered or connected via hdmi you can see the shot on a large screen to cut down on walking back to the cam...

The YN560 III has a built in receiver. The YN 560 IV has a built in receiver/transmitter. Either of these can be used with the 560TX radio contoller. The beauty of the 560TX is that you can both trigger and change output/zoom on the 560 III/IV flash units directly from your camera. These are very economical and are great to work with. I wouldn't bother with the RF603 triggers.

All of the YN560 flashes are able to to be triggered optically using the onboard camera flash.

I got the 560TX along with 2 YN560 III flashes. I didn't get the YN560 IV since I never saw an instance where I would put the flash directly on the camera hot shoe.

I found the YN560TX very difficult to put on my E-M10 hot shoe, so I removed the four extraneous pins and just left the center contact in place. No more problems and the 560TX works just fine. I purchased the Canon version of the 560TX.

Maybe I should avoid the hassle, pay more and get the Cactus system ... time to think ...

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It really wasn't hard to do. Remove four screws and the flash shoe can be removed. Inside is a small circuit board. Remove the four screws holding in the circuit board. Once done, the pins are spring loaded and may be removed easily. Hold onto the pins and springs in case later you want to reverse the operation.

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